Six Flags Magic Mountain, formerly known and colloquially referred to as simply Magic Mountain, is a 209-acre (85 ha) amusement park located in Valencia, California, 35 miles (56 km) northwest of downtown Los Angeles. It opened on May 29, 1971, as a development of the Newhall Land and Farming Company and Sea World Inc. In 1979, Six Flags purchased the park and added "Six Flags" to the park's name.

Valencia is an unincorporated community in northwestern Los Angeles County, California, United States. The area, west of Interstate 5, is expanding with residential development and already includes major commercial and industrial parks. It straddles State Route 126 and the Santa Clara River.